The position of the objects on the sky were generally measured to a precision between 1 and 4 arcsec. ... For the stars, the position is always at epoch 2000, whatever J2000 or B1950 coordinates are printed. ... The celestial position is given as coordinates in 4 different systems: . ... B1950 . ... Galactic coordinates in the reference frame called "new" system, adopted by IAU in 1958. Galactic pole at B124900.0+272400, node at ra=282.25,l=33 deg (inclination 62.6 deg). ... 1 arcsec . ...

Next: Photometry Up: Regions and Source Parameters Previous: *imcnts* - Find counts . This task (developed for use with optical images, but also useful with x-ray data) will quickly compute location, size, ellipticity, and position angle of sources. ... User can generate contour plots of any portion of the image and count rates in slices through the image. The program is advertised as ``quick [optical] photometry''. input file: rp110590_im1.imh . output file: logfile . ... Photometry . ...

... epevents (epevents-6.43) [xmmsas_20080701_1801-8.0.0] . ... A pattern analysis is made which yields four distinctive parameters: the number of pixels in the structure, the running pattern number within a frame, the pattern orientation (zero for singles and unresolved patterns; otherwise a three digit code, with the last digit specifying the orientation of the pattern and the first two the position of the pixel on the pattern ) and the distance (in pixels ) to neighbouring ...

The following general subroutines belong to the category IR: . ... Tells whether a detector is alive or dead. ( ircc_const.c ) . ... band number given a detector number ( ircc_const.c ) . ... Returns IRAS band numbers ( ircc_const.c ) . ... Returns IRAS detector numbers. ( ircc_const.c ) . ... Returns IRAS the number of detectors. ( ircc_const.c ) . ... Returns SDET number in IRDS for IRAS-ES detector number. ( ircc_const.c ) . ... To read BPHF data for ticks from an IRDS ( irds_samples.c ) . ...

... 2.1 What is Dithering? ... 2.4.1 No Dithering . ... 2.4.4 Dithering for Parallel Images . 2.5 More Detailed Considerations . 2.5.1 Data Quality Issues involved in Dithering . ... 2.5.4 How many Images to Obtain at each Dither Location . ... 3.2.3 Drizzle . ... 3.4 Image Fidelity After Drizzling . ... 4.2.1 Introduction . ... 5.3.2 Parameters . 5.3.3 Basic Examples . ... 5.4.8.1 General Explanation . 5.4.8.2 Parameter Details . ... 5.5 Optimizing the Drizzle Parameters for Your Data . ...

... Consequently, it is inappropriate to expand and in ordinary spherical harmonics. The proper expansion expresses both and simultaneously in terms of a particular order of generalized spherical harmonics. ... Generalized spherical harmonics start at , and for each , . ... Generalized spherical harmonics obey a sum rule analogous to a familiar one for ordinary spherical harmonics, but it includes an explicit phase factor which depends on the orientation of the two lines of sight. ...

... Impact of Covariance Information on the Orientation Parameters Between Radio Source Position Catalogs, IVS 2012 General Meeting Proceedings, p.339­341 http://ivscc.gsfc.nasa.gov/publications/gm2012/sokolova.pdf Impact of Covariance Information on the Orientation Parameters Between Radio Source ... IVS Analysis Centers provide these catalogs in a standard IERS format, where together with radio source positions and other relevant information, RA/DE correlations are reported. ...

... commands . scl . ... echo on | off : echo input commands to "stdout" . end : exit program . exit : exit program . ... Valid parameter groups are currently: meth, cont, data, slv, syn, gen, macro, all define <macro_name> : define a macro . The macro is defined by additional commands on the same and subsequent input lines up to the next "end" statement. For example: define my_fit; slv_teff1 25.0 1.0; solve; end run >macro_name< : run a previously defined macro . ...

. Telescope parameters (Coordinates, Reflector Info, Performance, etc.) . Current Receiver Status . Arecibo New Users' Guide (astronomy) . Arecibo Airglow and Lidar Instrumentation . Telescope Monitor and Control Software . Miscellaneous Facts . Last updated: Monday, 02-Nov-2009 09:46:52 AST . R. Minchin

General Knowleges about Astrometry. ... Universal Tool, Meridian Tool, Meridian Circle, Vertical, Photografic Zenithal Telescope, Astrolabe, Zenith Telescope, Horizontal Meridian Circle, etc. Meridian Principle of Objects' Coordinates Determination. ... Absolute and Relative Methods of Coordinates Determination. ... Photografic Method in Astrometry. Telescopes for Position Observations by Photografic Method. ... Basis and Theory of Photografic Method of Coordinates Determination. ...

STEP INTO THE BLUE - MEADE INSTRUMENTS PRODUCT GUIDE . ... Telesco